add: two poiners

data_structures/src/KeyPatterns/SlidingWindow/MinMaxExample.java

@@ -0,0 +1,60 @@
+package KeyPatterns.SlidingWindow;
+
+public class MinMaxExample {
+    public static void Examples() {
+        basic();
+        findingSmallerLarger();
+        dailyTempleratureMonitoring();
+        keepingValueWithinRange();
+        comparingTransactionLimits();
+        gamingHealh();
+    }
+
+    private static void gamingHealh() {
+        System.out.println("\n(Min Max) Gaming Health ==> ");
+        int health = 90, maxHealth = 100;
+        health = Math.min(health + 20, maxHealth);
+        System.out.println("Current Health ==> " + health);
+    }
+
+    private static void comparingTransactionLimits() {
+        System.out.println("\n(Min Max) Comparing Transation Limits ==> ");
+        double withdrawAmount = 500.0, balance = 300.0;
+        double maxWithdraw = Math.max(withdrawAmount, balance);
+        System.out.println("Allowed withdrawal: $" + maxWithdraw);
+    }
+
+    private static void keepingValueWithinRange() {
+        System.out.println("\n(Min Max) Keeping value within range ==> ");
+        int value = 120, min = 0, max = 100;
+        int clampedValue = Math.max(min, Math.min(value, max));
+        System.out.println("clampedValue ==> " + clampedValue);
+    }
+
+    private static void dailyTempleratureMonitoring() {
+        System.out.println("\n(Min Max) Daily Temperature Monitoring ==> ");
+        double templ1 = 18.5, temp2 = 22.1;
+        double lowest = Math.min(templ1, temp2);
+        double highest = Math.max(templ1, temp2);
+        System.out.println("Lowest temp : " + lowest);
+        System.out.println("Highest temp : " + highest);
+    }
+
+    private static void findingSmallerLarger() {
+        System.out.println("\n(Min Max) Finding the Smaller/Larger Number in a List ==> ");
+        int[] numbers = { 15, 3, 7, 22, 10 };
+        int minVal = numbers[0], maxVal = numbers[0];
+        for (int num : numbers) {
+            minVal = Math.min(minVal, num);
+            maxVal = Math.max(maxVal, num);
+        }
+        System.out.println("Min: " + minVal + ", Max: " + maxVal);
+    }
+
+    private static void basic() {
+        System.out.println("\n(Min Max) basic Usage ==> ");
+        int a = 10, b = 20;
+        System.out.println(Math.min(a, b));
+        System.out.println(Math.max(a, b));
+    };
+}

data_structures/src/KeyPatterns/SlidingWindow/Practice.java

@@ -7,7 +7,7 @@
 import java.util.TreeMap;
 
 /**
- * Sliding Window Practice
+ * Sliding Window and Two Pointers Practice
  */
 public class Practice {
     public static void Examples() {
@@ -18,6 +18,30 @@ public static void Examples() {
         mergeTwoSortedArrays();
         moveZeroToEnd();
         System.out.println("\n(Two Pointers) TwoSum Sorted ==> " + Arrays.toString(TwoSumSorted()));
+        maxArea();
+    }
+
+    /**
+     * Container with Most Water
+     */
+    public static void maxArea() {
+        System.out.println("\n(Two Pointers) Container with most water ==> ");
+        int[] height = { 1, 8, 6, 2, 5, 4, 8, 3, 7 };
+        int left = 0, right = height.length - 1;
+        int maxArea = 0;
+
+        while (left < right) {
+            int h = Math.min(height[left], height[right]);
+            int width = right - left;
+            maxArea = Math.max(maxArea, h * width);
+
+            if (height[left] < height[right])
+                left++;
+            else
+                right--;
+        }
+
+        System.out.println("Answer => " + maxArea);
     }
 
     /**

sql/full_course/multi_tenant_ecommerce/db_tables/tables.sql

@@ -0,0 +1,34 @@
+USE multi_tenant_ecom_db;
+
+CREATE TABLE Users (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) NOT NULL,
+    uesr_type VARCHAR(50) CHECK (user_type IN ('customer', 'vendor')) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE Vendors (
+    id SERIAL PRIMARY KEY,
+    user_id INT UNIQUE NOT NULL REFERENCES Users(id),
+    company_name VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE Products (
+    id SERIAL PRIMARY KEY,
+    vendor_id INT NOT NULL REFERENCES Vendors(id),
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+    price DECIMAL(10, 2) NOT NULL,
+    stock_quantity INT NOT NULL CHECK (stock_quantity >= 0),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE Orders(
+    id SERIAL PRIMARY KEY,
+    customer_id INT NOT NULL REFERENCES Users(id),
+    status VARCHAR(50) CHECK (status IN ('pending', 'shipped', 'delivered', 'cancelled')) DEFAULT 'pending',
+    total_price DECIMAL(10, 2) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);